High School DxD HERO

Issei and the 2nd years attend a class trip to Kyoto for well-deserved relaxation, leaving the senior and junior class students of the Gremory family behind. However, once there, they fall under attack and must win without Rias or their other powerhouses.<br><br>(Source: Anime News Network)<br><br> <i>Note: Includes episode 0, Taiikukan-ura no Holy</i>.